$.MvcSheet.Validate = function () {
    if ($.MvcSheetUI.SheetInfo.ActivityCode == "Activity2") {
        if (this.Action == "Submit") {
            var value = $.MvcSheetUI.GetControlValue("FJ");
            if (!value){
                alert("病假必须要上传证明附件");
                return false;
            }
        }
    }
}